The first hour of light at Durslade Farm settles not on the ground, but in the air. Piet Oudolf’s perennial meadow holds the morning like a drawn breath—Selinum wallichianum and Eryngium giganteum rising on wiry stems, their heads just brushing a bank of low mist. A dew-heavy stillness, the scent of warm earth and crushed Mentha longifolia. It is a tableau of suspension; a garden that feels less planted than exhaled.
Down the central path, Stipa gigantea catches the first horizontal rays, its oat-like panicles turning to a haze of pale gold. For a designer, this is the summer moment that justifies every structural gamble: the garden performing not as colour, but as atmosphere. It is a condition to be studied, not merely admired.
The Perforated Light of Umbellifers
There is a particular quality of light that only umbellifers can create—dappled, punctured, as if seen through a scrim of fine lace. Selinum wallichianum, with its delicate, fern-like bracts, scatters sunlight across neighbouring Echinacea pallida without obscuring it. Oudolf uses this transparency knowingly, layering umbellifers throughout his schemes so that the garden never reads as a solid block.
At Hauser & Wirth Somerset, Ammi majus and the statuesque Ferula communis act as soft architecture. They form an interstitial world—a web of green and white that atomises the heavier forms of Monarda and Phlomis. The effect is one of a garden half-drawn, perpetually in the process of becoming.
What these plants offer is not substance, but interval. They create breathing room in the border, a sense that light moves through the planting rather than merely falling upon it. The American designer Claudia West has called this “the interplanted matrix”—a phrase that might have been coined for the umbellifer’s particular genius.
The Draw of Dry Heat: Grasses in Ascendance
By late morning, the temperature climbs and the garden begins to murmur. Molinia caerulea ‘Transparent’ shimmers in the slightest breeze, its fine stems billowing like smoke over a low tide of Sedum telephium. Grasses are the season’s kinetic engine, converting stillness into a constant, subtle motion that pulls the eye across the space.
Panicum virgatum ‘Northwind’ stands bolt upright in the noon glare, a rigid counterpoint to the fluidity of Molinia. Nearby, Stipa tenuissima foams around the ankles of Verbena bonariensis. This is not chaos; it is a calculated choreography. The grasses soften edges, dissolve boundaries, and lend a shimmering restlessness to even the most austere planting.
“I am always looking for plants that hold light, that suspend it,” says Dan Pearson. “In high summer, the garden breathes through its grasses.”
Pearson’s 2015 Laurent-Perrier Garden at Chelsea harnessed this breath to great effect. Molinia swam through a grove of coppiced hazels, the panicles catching the filtered light like frozen drizzle. It was a study in restraint, and a reminder that summer’s energy often lies in texture, not flower.
Blue Hours: The Restrained Palette
Under the high, sallow sky of a summer afternoon, colour behaves differently. The saturated reds and oranges that thrilled in June now feel loud, almost aggressive. What endures is the cool register—Perovskia atriplicifolia’s lavender-grey haze, the metallic sheen of Eryngium × zabelii ‘Big Blue’, the inky depths of Agapanthus ‘Black Pantha’.
These are not monochromes but a deep, reverberating chord. In the Long Border at Great Dixter, a ribbon of Perovskia lifts the whole composition, its spires threading through maroon dahlias and golden Rudbeckia without ever dominating. It is a reminder that blue is the garden’s exhalation—a colour of distance, of shadow, of thought.
Nepeta racemosa ‘Walker’s Low’, with its soft grey-green foliage and catmint blooms, carpets the feet of taller plants, spilling over the edges of brick paths. Alongside the silver swords of Astelia chathamica and the ghostly presence of Artemisia ‘Powis Castle’, a border can become a study in tone rather than pigment. It asks for the eye to slow down, to discern.
Afternoons of Scent and Heat
The hot garden is not a visual experience alone; it is olfactive, a slow-baked perfume that lies heavy in the still air. Philadelphus ‘Belle Etoile’ has long dropped its petals, but the scent of mock orange lingers in memory. Now it is replaced by the creamy, jasmine-like fragrance of Trachelospermum jasminoides, spilling over a south-facing wall, and the honeyed sweetness of Cestrum parqui released only after dusk.
At Barnsley House, Rosemary Verey’s legendary laburnum walk gives way in summer to borders thick with lavender. Lavandula angustifolia ‘Hidcote’ and Lavandula × intermedia ‘Grosso’ release their oils with every brush of a trouser leg. The scent is the very essence of a Mediterranean summer, distilled in a Cotswold valley.
In the twilight, Lonicera periclymenum ‘Serotina’ twines through a crab apple, its perfume intensifying as the light fades. These olfactory layers are the garden’s memory palace; they stamp a moment in time more indelibly than a photograph ever could. They are the reason a designer lingers after sundown, breathing slowly.
The Aesthetics of the Spent
By mid-August, the garden begins its slow turn toward seed. This is not a moment of decline but of transmutation. Allium ‘Globemaster’ stands in browned, skeletal spheres, its starry seedheads backlit like tiny observatories. Papaver somniferum pods, pewter-blue and swollen, nod on stiff stems. Lunaria annua’s translucent discs shimmer like mica.
This is the territory Oudolf has made his own: the idea that a plant’s afterlife is as important as its bloom. In the Oudolf Field, seedheads are not cut down; they are allowed to stand through the autumn, capturing frost and cobweb, each stage a new aesthetic proposition.
“A garden is not a picture frozen in time. The skeleton, the seedhead, tells the story of the season,” Piet Oudolf once said.
For the designer, this extends the garden’s arc beyond the floriferous peak of June. It demands a new rhythm of maintenance—one of editing, not erasing. A spent stem of Phlomis russeliana, with its tiered whorls of seed, becomes sculpture. The designer’s eye must learn to treasure the architecture of the afterbloom, and to resist the impulse to tidy it away.
The Long Gaze: A Garden for the Mind
Summer’s real gift is this extended, contemplative pause. The high heat flattens the afternoon, stretches the shadows, and invites a different kind of looking. From the Tower at Sissinghurst, the garden rooms below arrange themselves like a series of green chambers, each framed by yew and filled with a soft, shimmering light. It is the view Vita Sackville-West knew at this exact hour: the sun catching the white garden, the roses at their most luminous, and then, slowly, the long dissolve into evening.
This is the garden as mental landscape, a place where form and atmosphere become inseparable. The drifting panicles of Stipa, the hollow stems of spent alliums, the blue distance lent by a stand of Perovskia—all conspire to draw the mind outward, beyond the boundary fence, into a state of suspended attention.
The best summer gardens are not loud; they are patient. They hold the light, but they also hold the silence between notes. To sit in them is to understand that gardening is not merely the cultivation of plants, but the shaping of time.
The term “interplanted matrix” did not emerge from the drawing board alone. It arrived as a distillation of ecological observation—Claudia West and Thomas Rainer’s influential 2015 book Planting in a Post-Wild World argued for a shift away from the static, isolated plant specimen toward a dense, interactive community of species occupying every niche from canopy to soil surface. In this framework, plants operate not as individual performers but as interlocking components of a living tapestry.
Umbellifers, with their filigree foliage and airy inflorescences, are natural matrix species. They slip into the gaps between more muscular perennials without competition, their roots drawing moisture from deeper layers while their translucent crowns filter light to the understory. At RHS Wisley, the trials of Ammi visnaga ‘Green Mist’ demonstrate how a plant can be at once structural and ethereal, forming a green lattice that binds Echinacea and Calamagrostis without ever claiming centre stage.
What Rainer and West propose is a rejection of the border as a series of distinct objects, each demanding its own halo of bare soil. Instead, they champion a ground plane of low, resilient species—Sesleria autumnalis, Carex pensylvanica, Geranium macrorrhizum—that knit the earth together, preventing weed ingress and visual fragmentation. The taller matrix plants, the umbellifers and the grasses, then rise through this green floor as punctuation, not islands. The result is a planting that breathes horizontally as much as vertically.
“A meaningful matrix is not filler,” West clarifies. “It is the net that catches the eye, the ecological and aesthetic glue.”
This thinking has reshaped contemporary planting design. Dan Pearson’s Garden of the Senses at the Tokachi Millennium Forest in Hokkaido relies on a matrix of Sesleria and Molinia to connect the episodic drifts of Eremurus and Sanguisorba. At Walmer Castle, the new Wildflower Matrix Meadow by Nigel Dunnett employs Silene vulgaris and Leucanthemum vulgare as the connective tissue between flowering perennials, creating a shimmering ebb and flow across the
